Instrument-Specific High-Pressure Gauge Elbow (also known as  Pressure Gauge Buffer Tube / Condensation Elbow) .

I. Definition and Core Functions

This is a specially designed curved protective fitting for high-pressure applications, connecting high-pressure pipelines to pressure gauges/transmitters. Its core functions are buffering, condensation, and interface adaptation:

Damping high-pressure pulses: Attenuates pressure surges caused by compressor start/stop cycles and load fluctuations, preventing needle overshoot and mechanism damage in pressure gauges;

Liquid seal cooling: Retains condensed liquid in the curved chamber, preventing direct entry of high-temperature refrigerant/steam into instruments to ensure measurement accuracy and extend service life;

Valve-equipped for maintenance without shutdown (typically fitted with a needle valve), facilitating instrument replacement;

Unified threaded interface (resolves mismatches between instrument and pipeline specifications).

2: Structural Types and Common Specifications

Angle and Shape:

90° (L-type): Most commonly used, space-efficient;

180° (O-type / Ring-type): Superior cushioning and condensation performance, suitable for high-pulse/high-temperature applications;

U-type: Enhanced liquid sealing, used for steam or high-temperature/high-pressure liquids.

3:Interfaces and Threads 

Connection Type    Common Specifications    Applicable Devices

Internal Thread (Meter Connection)    M20×1.5, M14×1.5        Standard high-pressure gauges

External Thread (Pipe Connection)    G1/2“ (4 mm), NPT1/2” High-pressure copper tubing / steel pipe

4：Material and Pressure Resistance 

    304/316 Stainless Steel (Corrosion-resistant, compatible with refrigerants like R410A and  demanding operating conditions, 

    pressure-rated up to 35MPa+, seamless tube construction);

5. Selection and Installation Guidelines

Three Key Selection Factors:

- Maximum system pressure (allow 1.5 times safety factor)

- Corrosiveness of refrigerant/medium

- Connection thread specifications

Installation Orientation:

- Bend tube opening upward/toward instrumentation to ensure condensate forms liquid seal and prevents backflow

Sealing: Use PTFE tape or specialized refrigerant sealant; ordinary tape is strictly prohibited.

Install a shut-off valve (needle valve) for convenient online maintenance and to prevent refrigerant leakage.

Keep away from strong vibration sources; add mounting brackets if necessary.

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